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Undo Space: It is not getting to 0% usage after LCP
Posted by: Thomas Waibel-BGo
Date: November 30, 2017 04:56AM

Hi,
we started now monitoring the undo space after having a problem with a hanging Local checkpoint (LCP)
( https://forums.mysql.com/read.php?25,661125,662601#msg-662601 ).

A LCP takes about 2 1/2 hours to complete. The undo space usage goes down with the successful LCP - but it does not go down to 0% (see https://data.boerse-go.de/ndb-cluster-undo-space-usage.png ).

My expectancy is that after a LCP the undo space usage should become 0% again.

Is that not so?

Best regards

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